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Until the end of 2012, a set of dedicated sky observations was executed regularly on CRIRES and on VISIR, in order to measure the current PWV content of the atmosphere. For CRIRES, this was OB #200179115 ("PWV_5050p4"). For VISIR, this was OB #200154321 ("SkySpectrum_MR_BurstMode"). The output data were analyzed on the fly by a routine which fits the telluric lines to a model. The results were written into the nightlog and into the following table. The fitting routine, and its integration into operations, had been implemented by Alain Smette.
Find here the FIT results from CRIRES telluric spectra:
2006 | 2007 | 2008 | 2009 | 2010 | 2011 |